Abstract
Modulation of metamaterials in the near-infrared regime is limited by the availability of efficient reconfigurable materials at high frequencies. Here we demonstrate a metasurface that minimizes power requirements and enhances switching speed by placing thin nanodisks of vanadium dioxide (VO2) phase-change material in the feed gaps of an array of bow-tie field antennas. The device is tunableover 360 nm in the near infrared and exhibits a modulation depth of 33% at the resonant wavelength. The metasurface employs integrated local heating to drive the insulator-to-metal transition of VO2 leading to faster switching and more precise spatial control compared to devices based on phase change thin films. The characteristics of this device foreshadow new opportunities for signal processing, memory, security and holography at optical frequencies.
| Original language | English |
|---|---|
| Article number | NoW3C.1 |
| Journal | Optics InfoBase Conference Papers |
| State | Published - 2017 |
| Externally published | Yes |
| Event | Novel Optical Materials and Applications, NOMA 2017 - New Orleans, United States Duration: Jul 24 2017 → Jul 27 2017 |
Funding
We gratefully acknowledge support from the National Science Foundation (CBET-1336455) and the United States Department of Energy, Office of Science (DE-FG02-01ER45916). A portion of this research was also sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U. S. Department of Energy. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. We gratefully acknowledge support from the National Science Foundation (CBET-1336455) and the United States Department of Energy, Office of Science (DE-FG02-01ER45916). A portion of this research was also sponsored by theaLboratoryiDecrtedeRsearchnadeDvelopment ProgramfoaOkiRgdeaNtnial Loaboratory, managedybTU-Battelle, LLC, for the U. S. Department of Energy. A portion of this research was conducted at the Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility.